Term
| With respect to water supplies BART uses? |
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Definition
| Local domestic water supply |
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Term
| With respect to water supplies BART uses? |
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Definition
| Local domestic water supply |
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Term
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Definition
| Static and residual as well as fire flow will fluctuate with local peak usage, pressure zone locations, valve closures, efficiency of grid system, distributor size and age. |
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Term
| Within the BART system water supply can be categorized into? |
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Definition
| The areas of stations above and below grade, underground trackways |
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Term
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Definition
-Have platforms approx. 30' above grade
-FF will experience head pressure loss of about 15 psi in addition to FL in wet standpipe system.
-Be prepared to augment the pressure as needed by pumping into the wet standpipe FDC at each respective station |
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Term
| Stations Below Grade One Level |
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Definition
-Stations having the platform one level below grade will experience an increase of approx. 15 psi nozzle pressure compared to pump panel discharge
-Be prepared to augment pressure as necessary by pumping into FDC
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Term
| Stations Below Grade Multiple Levels |
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Definition
-Stations with platforms multiple levels below grade may experience increased head pressure of up to 45psi above pump panel discharge pressure, depending on the distance of fire operations below grade
-Significant increase will affect both firestream operations and FF safety
-IC may consider having hose lines gated back to retard fire flow
-Stations 12th st and 19th St, SF Embarcadero through Civic Center |
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Term
| Within BART underground trackways consist of two parrallel bores with cross passage doors, and have wet standpipes except? |
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Definition
| Oakland Wye and the Berkeley Hills Tunnel |
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Term
| Standpipe within underground trackways outlets are marked by? |
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Definition
| Blue dots on the walkway directly under the outlet and a blue reflector mounted on the opposite tunnel wall. |
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Term
| Outlets within the underground trackways are located ever? |
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Definition
| 250' to 300' and designed so fire crews can reach the seat of any fire underground with no more than three lengths of hose from one direction |
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Term
| The exception to the 250' to 300' outlet spacing within BART is? |
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Definition
| The Transbay Tube where the distance is 330' adjacent each cross passage door |
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Term
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Definition
-Consists of two parrallel bores that are 3. miles long with cross passage doors approx every 1000'
-2 1/2" wet standpipe outlets are spaced every 250-300'
-the major concern is the elevation drop of 250' from the Orinda to Oakland ends of the tunnel |
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Term
| Are there pressure reduction valves in the Berkeley Hills Tunnel? |
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Definition
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Term
| With respect to the Berkeley Hills Tunnel the Orinda and Oakland IC Posts are equipped with tunnel maps that indicate vertical pressure zones (based on milepost markers) |
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Definition
| It is necessary or fire attack line pressures to be increased and the maps indicate what pressures must be pumped into the FDC connections to achieve nozzle pressures for each vertical pressure mile post. |
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Term
| What are the two significant water supply issues with the BHT? |
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Definition
-Oakland ICs should consider if it is safe to pump into supply lines at pressures equal to the maximum test pressure of our hose for extended periods
-During fire attack, lines may have to be gated back to achieve effective firestreams and prevent injuries to firefighters |
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Term
| Transbay Tube BART Water Supply |
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Definition
-consists of an 8' main supplied from both San Francisco and Oakland sides
-has 3" outlets in both bores at cross passage doors every 330' |
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Term
| The water supply in the Transbay Tube |
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Definition
| Is a wet system with three motor operated valves. One at either end of the tube in the oakland and san francisco structures and the third one is in the center of the tube in the upper gallery. |
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Term
| Are the three motor operated valves in the Transbay tube open at all times? |
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Definition
| Although it it a wet system these valves remain closed until there is a fire or other event that requires that they be opened such as service or testing. |
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Term
| Are the three motor operated valves in the Transbay tube are controlled by? |
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Definition
| Remotely by BART Central when water is needed, however they can be operated locally by fire personnel by either switching from remote to local control and turning on the motor to open the valve or disengaging the motor and operating the valve manually; the valves are standard OS&Y |
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Term
| Are there auxiliary pumps in the Transbay Tube? |
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Definition
-There are two auxiliary pumps connected in parallel, in each vent structure with 500 GPM capacities.
-Whether activated remotely or by BART Central or locally by fire personnel, they can be turned on individually or together
-When both are turned on they deliver 1000GPM |
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Term
| Are there auxiliary pumps in the Transbay Tube? |
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Definition
-There are two auxiliary pumps connected in parallel, in each vent structure with 500 GPM capacities.
-Whether activated remotely or by BART Central or locally by fire personnel, they can be turned on individually or together
-When both are turned on they deliver 1000GPM |
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Term
| What is the head pressure at the lowest point of the Transbay Tube? |
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Definition
60psi of head pressure and no pressure reducing valves in the system.
ICs may consider having hose lines gated |
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Term
| Where are FDCs located for the Transbay Tube? |
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Definition
FDCs are located at both the San Francisco and Oakland Vent Structures to augment the pressure if needed.
Due to head pressure the only reason to augment pressure in the tube would be due to total loss of domestic water supply.
FDC on the SF side are adjacent to the Bay and could be supplied either by their fireboat or drafting |
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